3. solve the system y=-x+3x-2 and y= 48–
a) {(3,-1)}
b) {(3, 11: 5), (1,3.5)}
c) {(3, 11: 5), (-1, -4.5)}
d) {(-4.5, 11: 5)}

B. 2.

Step-by-step explanation:

You can find the average by substituting the given values in the function, then  do an arithmetic average with results.

So, for X = - 1 you get f(-1) = 1

For X = 0 you get f(0) = 3

So, the average with 1 and 3 is 2. Because you sum numbers which results 4, and then divided by 2 (the amount of numbers involved in the average).